نتایج جستجو برای: psammogeton canescens dc
تعداد نتایج: 56291 فیلتر نتایج به سال:
The Eurasian badgers (Meles spp.) are widespread in the Palaearctic Region, occurring from the British Islands in the west to the Japanese Islands in the east, including the Scandinavia, Southwest Asia and southern China. The morphometric variation in 30 cranial characters of 692 skulls of Meles from across the Palaearctic was here analyzed. This craniometric analysis revealed a significant dif...
Novel carbasugars derived from cyclohexane-1,2-dicarboxylic acid were synthesized and tested for inhibitory activity towards fungal glycosidases from Aspergillus oryzae and Penicillium canescens. Significant inhibition was observed, which magnitude depended on configuration of substituents.
Both arrhenotokous and thelytokous reproduction are known to occur in the parasitoid wasp Venturia canescens. The cytological mechanism of thelytoky was previously reported to involve the formation of a restitution metaphase after the reduction division, but the exact nature of the subsequent divisions, whether reductional or equational, remained unclear. We reinvestigated the cytological mecha...
MOSFET is the most commonly used devices in DC-DC power converters, and its performance is important to the prognosis and health management of power. The paper proposes a degradation analysis model for MOSFET in DC-DC power converters. A method for detecting the degradation of MOSFET is also introduced. Simulations have shown that the method can predict deterioration in the performance of MOSFE...
یادگیری نشانههای جدید در تمامی شاخههای زیستی جانوران از موجودات تکسلولی تا پستانداران به صورتهای مختلف رخ میدهد. حشرات برخلاف جثه کوچک و طول عمر کوتاه، توانایی خارق العادهای را در یادگیری، به خاطر سپردن و بکارگیری نشانههای مختلف محیطی مرتبط با حضور میزبان و منابع غذایی دارا میباشند. این توانایی از عوامل موثر در افزایش کارایی و قدرت جستجوگری دشمنانطبیعی همچون زنبورهای پارازیتوئید مانن...
The thermoelectric transfer difference of Thermal Converters (TCs) can be evaluated in both current mode and voltage mode, using a fast-reversed dc (FRDC) source. Some types of TCs show differences in the thermoelectric transfer difference between voltage and current mode as large as some parts in 10. In order to investigate the origin of the discrepancy, the change of the thermoelectric transf...
In bryophytes a morphological species concept is still most commonly employed, but delimitation of closely related species based on morphological characters is often difficult. Here we test morphological species circumscriptions in a species complex of the moss genus Racomitrium, the R. canescens complex, based on variable DNA sequence markers from the plastid (rps4-trnT-trnL region) and nuclea...
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